3 90 time allowed : 3 hours maximum marks : 90
TRANSCRIPT
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OXS1PMW
-I, 2015-16
SUMMATIVE ASSESSMENT – I, 2015-16 / SCIENCE
X / Class – X
3 90
Time Allowed : 3 hours Maximum Marks : 90
1.
2.
3.
4. 1 3
5. 4 6 30-30
6. 7 18 50-50
7. 19 24 70-70
8. 25 33
9. 34 36
General Instructions : 1. The question paper comprises of two Sections, A and B. You are to attempt both the
sections. 2. All questions are compulsory 3. All questions of Section-A and all questions of Section-B are to be attempted separately. 4. Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in
one word or in one sentence 5. Question numbers 4 to 6 in Sections-A are two marks questions. These are to be answered
in about 30 words each. 6. Question numbers 7 to 18 in Section-A are three marks questions. These are to be
answered in about 50 words each 7. Question numbers 19 to 24 in Section-A are five marks questions. These are to be
answered in about 70 words each. 8. Question numbers 25 to 33 in Section-B are multiple choice questions based on practical
skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you.
9. Question numbers 34 to 36 in Section-B are questions based on practical skills. Each question is of two marks.
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SECTION-A
1
State the role of the brain in reflex action.
1
2
What does the degree of closeness of the field lines represent ?
1
3
Name the part of a biogas plant where reactions take place in the absence of oxygen.
1
4
x →
(a) 'x'
(b)
Consider the following chemical reaction :
xWater → Slaked lime
(a) Write the chemical name of 'x' and the type of reaction that occurs.
(b) Write chemical equation of the reaction.
2
5
A white chemical compound becomes hard on mixing proper quantity of water. It is also
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used to maintain joints in a fixed position. Name the chemical compound and write its chemical formula. Write the chemical equation to show what happens when water is added to this compound in proper quantity.
6 (i)
(ii)
(i) Name two waste products which are stored in old xylem in plants.
(ii) Name the process by which plants get rid of excess water. Name the pores through
which this process takes place.
2
7
Food when left for a long time tastes/smells bad. What is this condition called ? Mention any four
ways by which we can prevent this condition.
3
8 A B C
You are provided with three test tubes A, B and C which contain distilled water, acidic
solution and basic solution respectively. If you are given blue litmus paper only, how will
you identify the contents of each test tube ?
3
9
(a) (b) (c)
Write the names and symbols of the constituents present in the following alloys :
(a) Brass (b) Bronze (c) Solder
3
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10
Cu, Fe, Zn Ag
(i) CuSO4Fe FeSO
4Cu
(ii) FeSO4Zn ZnSO
4Fe
(iii) 2 AgNO3Cu Cu(NO
3)
22 Ag
Study the following reactions and explain their reactivity. Arrange Cu, Fe, Zn and Ag in increasing
order of their reactivity
(i) CuSO4Fe FeSO
4Cu
(ii) FeSO4Zn ZnSO
4Fe
(iii) 2 AgNO3Cu Cu(NO
3)
22 Ag
3
11
Draw a neat diagram of a portion of human alimentary canal showing, liver, pancreas,
gallbladder and their associated glands.
3
12
When growing plants detect light, name a hormone which is synthesised at the shoot tip. How
does this hormone affect the movement of shoot and why ?
3
13
"As the blood sugar level in our body falls insulin secretion is reduced". Justify this statement
in the reference of feedback mechanism that regulates the timing and amount of hormone
released.
3
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14 250 m 1 1.6108
The resistance of a wire of length 250 m is 1 ohm. If the resistivity of the material of wire is
1.6108 ohm metre, find the area of cross – section of the wire. How much does the
resistance change if the diameter is doubled ?
3
15
What is meant by Electromagnetic Induction? Describe an activity to demonstrate this
phenomenon.
3
16
Define magnetic field. Describe an activity to draw magnetic field lines around a bar magnet
from one pole to another pole.
3
17
(i)
(ii)
Burning of fossil fuels cause lots of air pollution. Generally these fossil fuels are used in our
vehicles.
(i) As an aware citizen, list two ways to reduce air pollution caused due to vehicles.
(ii) Write two harmful effects other than air pollution, that are caused due to burning of
fossil fuels .
3
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18
If energy can neither be created nor destroyed, explain with an example as to why we should worry about our energy resources ?
3
19
(i)
(ii)
(iii)
(iv)
(v)
Give reasons for the following :
(i) Calcium and magnesium are found in the combined form in nature while gold and platinum are found in the free state. (ii) Aluminium vessel loses its shine readily.
(iii) Aluminium cannot be obtained by reduction of its oxide with coke.
(iv) We cannot store silver nitrate solution in a copper vessel.
(v) When a piece of copper metal is added to a solution of zinc sulphate, no change takes
place, but the blue colour of copper sulphate fades away when a piece of zinc is placed in its
solution.
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20 (a)
(b)
(a) Illustrate an activity to investigate whether all compounds containing hydrogen are
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acidic.
(b) What happens when hydrochloric acid and sodium hydroxide are dissolved in water.
Explain giving equation of each.
21
Describe the mechanism of breathing in humans. How does the exchange of gases occur in
tissues? What happens to the carbon dioxide which is collected in human tissues ?
5
22 SI B
A
1
1.61019
What is meant by electric current ? Name and define its SI unit. In a conductor electrons are flowing from B to A. What is the direction of conventional current ? Give justification for your answer.
A steady current of 1 ampere flows through a conductor. Calculate the number of electrons
that flows through any section of the conductor in 1 second. (Charge on electron1.61019 coulomb)
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23 (a)
(b)
(c)
(a) Name the effect of electric current which is utilised in the working of an electrical fuse.
(b) How is a fuse connected in a domestic circuit ?
(c) Draw a schematic labelled diagram of a domestic circuit which has a provision of a main fuse, meter, one light bulb and a switch/socket.
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24 (a) PVI
(b) 50 W 25 W
(a) Define electric power. State its unit. Also derive formula of power PVI (b) Which will have higher resistance: a 50 W lamp bulb or a 25 W lamp bulb and by how
many times?
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/ SECTION - B
25 A, B, C D
pH pH
pH
(a) B < A < C < D (b) C < D < B < A
(c) A < B < C < D (d) B < D < A < C
Water, hydrochloric acid, sodium hydroxide solution and ethanoic acid were provided to a student in
the test tubes A, B, C and D respectively. On determining the pH of each solution by using pH paper,
the colour changed to green, red, blue and orange respectively. The correct order of solutions in
terms of increasing value of pH would be :
(a) B < A < C < D (b) C < D < B < A
(c) A < B < C < D (d) B < D < A < C
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26 (I), (II), (III) (IV) pH
pH pH
(I) (II) (III) (IV)
(a)
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(b)
(c)
(d)
A student was provided with four samples of solutions as shown in figures (I), (II), (III) and (IV). He
determined pH value of each solution by using pH paper. The correct sequence of colour change of pH
paper observed by the student will be :
(I) (II) (III) (IV)
(a) indigo light red green red
(b) red indigo green light red
(c) indigo red green yellow
(d) green red yellow indigo
27 10 mL I II
1
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(a) I II
(b)
(c) II I
(d)
10 ml each of hydrochloric acid and sodium hydroxide solutions were taken in two separate
beakers I and II as shown in the figure :
On adding zinc granules to both, it is observed that at room temperature :
(a) Gas is evolved vigorously in beaker I but not so in beaker II
(b) Gas is evolved vigorously in both the beakers
(c) Gas is evolved in beaker II but not in beaker I
(d) No gas is evolved in either of the two beakers.
28
(i)
(ii)
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(iii)
(iv)
(a) (i), (ii) (b) (ii), (iii)
(c) (iii), (iv) (d) (ii), (iv)
Betty added Aluminium metal to colourless solution of Zinc sulphate. After half an hour the
solution was observed. It was colourless. She recorded her observations in the following
statements.
(i) No reaction occurred
(ii) Reaction occurred and aluminium sulphate was formed
(iii) Zinc is more reactive than aluminium.
(iv) Aluminium is more reactive than zinc.
The correct observations are :
(a) (i), (ii) (b) (ii), (iii)
(c) (iii), (iv) (d) (ii), (iv)
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(a) (i) (ii) (b) (ii) (iii)
(c) (iii) (iv) (d) (ii) (iv)
Sanjay wanted to test the reactivity of zinc. He put zinc granules in four different solutions as
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shown below. He would observe that reaction takes place in –
(a) (i) and (ii) (b) (ii) and (iii)
(c) (iii) and (iv) (d) (ii) and (iv)
30
(a)
(b)
(c)
(d)
Total voltage across the series combination of resistors is :
(a) Same in every part of the circuit
(b) Sum of the voltage drop across each resistor
(c) Inversely proportional to the resistance
(d) None of these
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31 ?-
(a)
(b)
(c)
(d)
Two unequal resistances are connected in parallel by a student. Which of the following is true
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?
(a) Current is same is both
(b) Current is larger in higher resistance
(c) Voltage-drop is same across both
(d) Voltage drop is lower in lower resistance.
32
(a)
(b)
(c)
(d)
A leaf is boiled in alcohol before using iodine for starch test in order to:
(a) Dissolve starch (b) Dissolve chlorophyll
(c) Soften the leaf (d) Make it react with iodine
1
33 CO2
(a) NaOH (b) KOH (c) NaCl (d) KCl
In the experiment to show that 'CO2 is released during respiration', the solution in the test
tube is chemically :
(a) NaOH (b) KOH (c) NaCl (d) KCl
1
34
(i)
(ii)
2
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The following given chemical reactions can be classified in two different types of reactions
each. Write the names of two types of reactions for each statement.
(i) Quick time water slaked time Heat
(ii) Sodium sulphate solutionBarium chloride solution Barium sulphate
(solid)sodium chloride solution (precipitate)
35
(i)
(ii)
(iii) (i) (ii)
(iv) (i)
To maintain a steady current in a circuit, select two necessery conditions from the following :
(i) continuous circuit
(ii) development of potential difference
(iii) neither (i) nor (ii)
(iv) only option (i)
2
36
(i)
(ii)
(iii)
(iv)
2
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Ravi followed the following procedure for staining the temporary mount of leaf peel on the
slide.
(i) To put a single drop of stain on leaf peel and wash it with water.
(ii) Cover the leaf peel with cover slip.
(iii) To put a single drop of glycerine on leaf peel.
(iv) observe the slide under microscope.
But the steps are not in order. What should be the correct sequence ?
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